Determination of the liquid diffusion coefficient of the Sn-Ni peritectic alloy through temperature gradient zone melting
Determination of the liquid diffusion coefficient of the Sn-Ni peritectic alloy through temperature gradient zone melting
复制标题
温度梯度区熔法测定Sn-Ni包晶合金的液体扩散系数
DOI：
10.1016/j.ijheatmasstransfer.2020.119321
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发表时间：
2020-04
影响因子：
5.2
通讯作者：
Zhang Anqiao
中科院分区：
文献类型：
--
作者：
Peng Peng;Yue Jinmian;Zhang Anqiao
本文提出了一种测定二元包晶合金液相扩散系数D-L的新方法。该方法是基于热稳定过程中微观结构和熔体浓度的变化，这两者可以通过液滴在糊状区的迁移联系起来。在bridgman型定向凝固炉中对Sn-Ni包晶合金（L+Ni3Sn2 -> Ni3Sn4）进行了不同时间（2 ~ 8 h）的热稳定实验。两种不同的糊状区形成在热稳定的样品，保持静止在炉中。扩散控制的液滴迁移是由温度梯度区熔融（TGZM）重熔/再凝固引起的。这不仅导致糊状区固相(f(S))/液相（f(L)）体积分数的变化，而且导致全液区C熔体浓度的增加。因此，基于热稳定过程中的质量守恒，f(S)和f(L)不仅可以与液滴迁移速度v m相关，还可以与热稳定过程中全液区C熔体浓度相关。由于f(S)和f(L)很容易通过微观结构分析得到，所以给出了特定位置/温度下v(m)的实验值。然后，通过描述液体迁移过程中重熔/再凝固过程的解析模型，给出了D-L函数v(m)的表达式。最后，将v(m)的实验值与该解析模型的v(m)表达式等价，得到了Sn-Ni包晶合金的D-L和活化能。(C) 2020 Elsevier Ltd.版权所有。
In the present work, a new method determining the liquid phase diffusion coefficients D-L in a binary peritectic alloy is presented. This method is based on the evolution in both the microstructure and melt concentrations which can be linked through liquid droplet migration in the mushy zone during thermal stabilization. The thermal stabilization experiments of different time (2 to 8 h) are performed on Sn-Ni peritectic alloy (L+Ni3Sn2 -> Ni3Sn4) in a Bridgman-type directional solidification furnace. Two different mushy zones are formed during thermal stabilization of samples which are kept still in the furnace. The diffusion-controlled liquid droplet migration is caused by remelting/resolidification by temperature gradient zone melting (TGZM). It leads to not only the variation of volume fractions of solid(f(S))/liquid(f(L)) phases in the mushy zone but also the increase of the melt concentration in the complete-liquid zone C. Thus, based on the conservation of mass during thermal stabilization, f(S) and f(L) can be correlated to not only the liquid droplet migration velocity v m but also the melt concentration in the complete-liquid zone C during thermal stabilization. Since f(S) and f(L) can be easily obtained through microstructure analysis, the experimental value of v(m) at specific location/temperature is given. Then, the expression of v(m) which is function of D-L is provided by an analytical model describing the remelting/resolidification process during the liquid migration. Finally, D-L and the activation energy of the Sn-Ni peritectic alloy are obtained by equating the experimental values of v(m) with the expression of v(m) by this analytical model. (C) 2020 Elsevier Ltd. All rights reserved.
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DOI：
10.1007/s11663-004-0085-6
发表时间：
2004
期刊：
Metallurgical and Materials Transactions B
影响因子：
--
作者：
Je-Hyun Lee;Sha Liu;Hirofumi Miyahara;R. Trivedi;R. Trivedi
通讯作者：
Je-Hyun Lee;Sha Liu;Hirofumi Miyahara;R. Trivedi;R. Trivedi
DOI：
10.1016/0146-3535(83)90022-9
发表时间：
1983
期刊：
Progress in Crystal Growth and Characterization
影响因子：
--
作者：
V. N. Lozovskii;V. Popov
通讯作者：
V. N. Lozovskii;V. Popov
DOI：
10.1007/bf02672522
发表时间：
1991-02
期刊：
Metallurgical Transactions B
影响因子：
--
作者：
T. Lograsso;A. Hellawell
通讯作者：
T. Lograsso;A. Hellawell
影响因子：
3.2
作者：
Massimo Capobianchi;T. Irvine;N. Tutu;G. Greene
通讯作者：
Massimo Capobianchi;T. Irvine;N. Tutu;G. Greene
影响因子：
1.8
作者：
B. Bhat
通讯作者：
B. Bhat